hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14142) HBase Backup/Restore Phase 2: Cells deduplication during backup
Date Tue, 21 Jul 2015 21:21:04 GMT
Vladimir Rodionov created HBASE-14142:

             Summary: HBase Backup/Restore Phase 2: Cells deduplication during backup
                 Key: HBASE-14142
                 URL: https://issues.apache.org/jira/browse/HBASE-14142
             Project: HBase
          Issue Type: New Feature
            Reporter: Vladimir Rodionov
            Assignee: Vladimir Rodionov

As since we do not record last backed up sequence ids (MVCC) and do not restore up to that
sequence id - that is kind of tricky, there will be some duplicates of KVs in store files
after first incremental restore after full backup. These duplicates are result of how we do
full backup and first incremental backup after full one. During full backup we perform distributed
log roll and record, for every RS, last WAL timestamp, then we do snapshot. The next WAL after
recorded one will make it into a next incremental backup set, but it will contains some edits
(puts, deletes) which have been recorded by a previous snapshot. During restore, we, first,
restore snapshot, then we will re-play WALs and this operation can create some duplicates
of KVs in different store files.

This message was sent by Atlassian JIRA

View raw message